[PATCH AUTOSEL 6.11 128/244] cgroup: Disallow mounting v1 hierarchies without controller implementation

Sasha Levin
2024-09-25T11:42:48Z

From: Michal Koutný <mkoutny@suse.com>

[ Upstream commit 3c41382e920f1dd5c9f432948fe799c07af1cced ]

The configs that disable some v1 controllers would still allow mounting
them but with no controller-specific files. (Making such hierarchies
equivalent to named v1 hierarchies.) To achieve behavior consistent with
actual out-compilation of a whole controller, the mounts should treat
respective controllers as non-existent.

Wrap implementation into a helper function, leverage legacy_files to
detect compiled out controllers. The effect is that mounts on v1 would
fail and produce a message like:
[ 1543.999081] cgroup: Unknown subsys name 'memory'

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/cgroup/cgroup-v1.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index b9dbf6bf2779d..784337694a4be 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -46,6 +46,12 @@ bool cgroup1_ssid_disabled(int ssid)
return cgroup_no_v1_mask & (1 << ssid);
}

+static bool cgroup1_subsys_absent(struct cgroup_subsys *ss)
+{
+ /* Check also dfl_cftypes for file-less controllers, i.e. perf_event */
+ return ss->legacy_cftypes == NULL && ss->dfl_cftypes;
+}
+
/**
* cgroup_attach_task_all - attach task 'tsk' to all cgroups of task 'from'
* @from: attach to all cgroups of a given task
@@ -932,7 +938,8 @@ int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param)
if (ret != -ENOPARAM)
return ret;
for_each_subsys(ss, i) {
- if (strcmp(param->key, ss->legacy_name))
+ if (strcmp(param->key, ss->legacy_name) ||
+ cgroup1_subsys_absent(ss))
continue;
if (!cgroup_ssid_enabled(i) || cgroup1_ssid_disabled(i))
return invalfc(fc, "Disabled controller '%s'",
@@ -1024,7 +1031,8 @@ static int check_cgroupfs_options(struct fs_context *fc)
mask = ~((u16)1 << cpuset_cgrp_id);
#endif
for_each_subsys(ss, i)
- if (cgroup_ssid_enabled(i) && !cgroup1_ssid_disabled(i))
+ if (cgroup_ssid_enabled(i) && !cgroup1_ssid_disabled(i) &&
+ !cgroup1_subsys_absent(ss))
enabled |= 1 << i;

ctx->subsys_mask &= enabled;
--
2.43.0